Wrong to ask husbands friends to not use downstairs bathroom?

My husband is having friends over tomorrow night, they are going to watch a fight on tv

We have a finished basement, it’s a really nice hangout spot, but we have a bathroom down there and I DONT want them using it, I don’t even want them knowing it’s down there.

So here’s the thing- the guy who lived here before us had his daughter renting out the basement. She moved out a long time ago, so the basement bathroom hasn’t been used in a long time, and I doubt the previous home owner used it bc he lived alone and had no reason to. So the bathroom is disgusting. It’s clean, but very very old and needs to be gutted. The bathroom itself doesn’t look terrible, it’s the toilet. I guess it rusted or something, but the inside is completely brown and rusty. We do want to redo the bathroom but because it’s in the basement, if we do the basement bathroom we could run into issues doing our main floor bathroom bc of the plumbing and pipes, so dealing with that bathroom is not something we are doing right now. In the meantime, I am embarrassed and don’t want anyone seeing it.

So I saw my husband attempting to make the bathroom look nice (it’s not going to, it is in really bad shape) and i told him I don’t want the guys using it. They can come upstairs and use the main floor bathroom. He is telling me I am rude and the bathroom isn’t “that bad” it really is bad. I debated posting pictures but I am embarrassed.

Am I wrong for saying the bathroom is off limits?

It’s not like I am saying pee outside. They can use our regular bathroom